周期的かく乱によるディフューザ内乱流はく離の抑制効果について

概要

論文の詳細を見る
The effects of periodic disturbance on a turbulent separating air flow in a two-dimensional diffuser have been investigated at the Reynolds number of 42000. The disturbance was generated by the external speaker and introduced from the walls of the asymmetric diffuser through a porous plug. With varying disturbance amplitude and frequency, the percent downstream flow, the pressure recovery coefficient, as well as the streamwise- and the normal velocity components, were measured. The results indicated the significant suppression of separation and the improvement of pressure recovery. This was mainly due to the periodic suction and injection from the wall but due to neither the change of the turbulence structure upstream of the incipient detachment point nor the excitation of instability in the separated shear layer.
一般社団法人日本機械学会の論文
1991-01-25